fft.py 文件源码

def argmax_p(fft_ordinate, rate):
    """ Find an argmax of fft result
    """
    upper_thresh_freq = 4100
    lower_thresh_freq = 800
    upper_thresh = int(len(fft_ordinate) / (rate / 2) * upper_thresh_freq)
    lower_thresh = int(len(fft_ordinate) / (rate / 2) * lower_thresh_freq)
    argmax = fft_ordinate[lower_thresh:upper_thresh].argmax()
    argmax += lower_thresh
    return argmax